Major Flood
37.5 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
36.5 ft
Minor Flood
33 ft
Action Stage
31.5 ft
What Floods at Each Level
36.5 ft
Buildings in the lumber yard near the M-28 bridge begin to flood
34.5 ft
The entire M-28 bridge is under water...with around a foot of water flowing over the east side of the bridge
34 ft
Water flows over the east side of the M-28 bridge
33 ft
The lumber yard near the M-28 bridge in Ewen begins to flood
28.5 ft
Water reaches the bottom of the M-28 bridge
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Apr 29, 2013 | 33.87 ft | 9,040 cfs |
| Apr 23, 2019 | 33 ft | 7,810 cfs |
| Apr 14, 2023 | 33 ft | 7,743 cfs |
About This Gauge
USGS Site
NWS LID
EWNM4
River
South Branch Ontonagon
County
Ontonagon, MI
Coordinates
46.5350°N, 89.2767°W
Get Flood Alerts for South Branch Ontonagon
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of South Branch Ontonagon at Ewen?
The South Branch Ontonagon at Ewen gauge is maintained by USGS (site 04039500) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for South Branch Ontonagon at Ewen?
The NWS-defined flood stage for South Branch Ontonagon at Ewen is 33 feet. Action stage begins at 31.5 feet. Moderate flooding starts at 36.5 feet, and major flooding at 37.5 feet.
How do I get alerts when South Branch Ontonagon rises?
Download StormCast free on Google Play, go to River Gauges, and add South Branch Ontonagon at Ewen to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the South Branch Ontonagon at Ewen gauge located?
The gauge is located in Ontonagon County, Michigan at coordinates 46.5350°N, 89.2767°W. USGS site number: 04039500. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
More Resources
Source & Notes
Data provided by: Observations courtesy of U.S. Geological Survey
- Stage measured manually and reported by river observer. No automated gauge on-site.